Sewing machine



FIG. 1 is a front perspective view showing my new design for a sewing machine,

FIG. 2 is a front view thereof,

FIG. 3 is a rear view thereof,

FIG. 4 is a left-side view thereof,

FIG. 5 is a right-side view thereof,

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings are included to show unclaimed subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a sewing machine, as shown and described. 